Took my car into Westphal Chevrolet in Oswego, IL to get the factory radio updated so the PDIM I installed would work. At first, they had no idea what I was talking about, but I patiently explained what it was and they agreed to give it a go. Even though it ended up taking almost three hours, they only charged me for half an hour. I'd have no problem taking my car back there for service. They were great.